Pull pointing machine



June 6, l950 Filed Nov. 6, 1947 E- WILLETT PULL POINTING MACHINE Fig.

3 Sheets-Sheet 1 Inventor E mest Wil/efl MIA/WW6} 29m June 6, 1950 E.WlLLETT PULL POINTING MACHINE Filed Nov. 6, 1947 3 Sheets-Sheet 2Inventor E mes! Willefl June 6,1950' E. WILLETT 4 2,510,788

' PULL POINTING MACHINE Filed Nov. 6, 1947 3 Sheets-Sheet 5 Fig.4.

Inventor E rnesr W-i/le/l Patented June 6,1950

PULL POINTING-MAGHINE 'Erne'stwillett, Gamma.

:Appiieatitimot mwer s, 1947,-sermim;784,323

Thisgi nvention relates a new-anduseful methodof poirrting metaloivether-barsandmachine -tor pullpointing thesame, so' fthata sectionor-area of thebar-undergoing thaapplieation o'fheat may be pu'Ile'd in 4oppositedirections from the point 7 where =it' -is heated; theapulli'n'gforeeexerted-fin opposite-direotions causing eiong'auonpi the bar Kileatitu'sarne time pausite es-bf th heated her' in opjpqultant'eiengati'on arates' orbiseet's oe the biseet he bar. h on" is toproigide r'ymg out thei the? c'oi'nbiu bisects i-r'iue I.

bar-pram? roeiamapurpose rbrewiiicn the? same inwhich':heat=:is'-1applied tara' portiort-ofthe'b'ar within its lengthandportion undergoing the application -ofwheat is caused to be" elongated*by pullingfl-on the-bar-atbpposite sides of the heated portion and inibp' posite dir ections" outwardly whileebeingl grippedgpreferablylay-opposed sets oflgripperscaused to take: outward-movement by opposedeeeefiliziie lan -en e that the heated poi: V

Figurefiieas-ide elevation partly brokerawai' and in: section; I

Figure 3 is aseetional' elevationtaken prettiestaggered: seetionfl line-3--3 of -Eigure 1,-With the eccentrics irr elevation aswellzas'thebearings for the shafts thereof; and, v H I Figured is; a horizontalsectional elevationwith portions broken away, one oi the; eeeentriewheels being shown "in sectionand-the other in elevation as. viewedsubstantially on the staggered-"section n E l "n i L I Referring totheigdrawings indetail, the nachine- 'for' pointing metal bars or pull,-pointing machine at the present invention; iorr praetleiug the methodeomprises-a-rnaehine bed Ifl of @1011:

. gated reetangular:constructionshown madeupiof elongated sides'and-ends; I I and IZ respeotive1 -y weldedor otherwise joinedv atthe-diagonal co ers I3 to previde-anppening vertically .therethrou'gh asindicated at-I 4 frorntopto bottom; and recessed at the top langes atthe end channels I2, asindicatedat I 5' for a, purpose to be hereinafternade a a e 'ted ah h i e I nt r e ate y of the ends thereoff asrat I 6,in vertical} positions, are stabilizer bearing supports I'harranged'aatopposite sidesand: extending outwardly there; from- 1:0 support inconnection; with the-vertieal end'fianges V I 8; thereof, a "fiat topplate I 9 which maybe welded theretoas indicated-at 20,-so' as-toproject beyond theends of the: stabilizer bearing supports I 7' atthe-ends orflanges I I8. Guide bars'2I are'mounted transversely on theplate 19 of the stabilizer bearing-supports I! in spacedparallelrelation. slightly inwardly ofgand parallel to the ends-or flanges I8to: extend across said plates and may besecured in position-by suitablemachinescrews-or' thelike: 22.

:The-machine-bed 1H1 upon opposite sides" there of; upon thetop'flan'ges'of 'the channels I I slight- 1yv outwardlyofthe-alignedend-edges of the plate I9,- suppdrtssuitable; pillow blockbearings 23 ivhicli may-be bolted to the": said fl'a'ngesrof the machinebed; as indicated at-24 through the'bais'e lugs or fianges thereof torotatably' supportrhori z'onta'lparal'll Shafts25' agaifist ndkthi ust.One

- end" oreaeh" shaft 25pi'ojectsiand ma 'ibe equipped with: asuitapiakeyor spline" indicated at? it; or?'o'tlrert suitable'gmeans forep'erativeddnhotiqfi with-a suitable' pfime: overor' drive' -mearis; and

by ian-i endless'idrive? member 1 28, although it is understood that anyother s'uitable" drive means;

may be employed'for pur pds wneretypower may be deli'vered toithe rshafts' 25 for rota the'fsam nnuitaneousl pp osite dire'etioiisdrawingsdownwardly at the inside. Each shaft is provided with an eccentric wheelor earn 29 fixed thereto in any suitable manner to rotate therewith andshown as comprising a disc with a hub 30 fixed or keyed to the shaft asindicated at 3| and provided with a peripheral flange 32 projectingoutwardly intermediate opposite caniming or eccentric flanges orsurfaces 33 in the form of circular flanges correspondingly tapering tozero at the flange 32 as indicated at 35 in convex form and graduallywidening to the point 35 substantially entirely around the circumferenceand then approaching the zero point or flange 32, as indicated at 36 ina comparatively abrupt taper or angle. That is, the abrupt curvatures 35ap proach the opposite sides of a central annular flange on theperiphery of each eccentric at a relatively sharp angle in spacedrelation to the gradually tapered ends or portions 34 where theyapproach the opposed faces of the flange 32. It should also be notedthat the recesses i accommodate the flanges 32 and adjacent portions ofthe eccentric flanges or surfaces 33 extending laterally in oppositedirections from opposite sides of said flange 32.

Mounted to slide in and out of the guide bars 2| are toggle box holders3'! in the form of horizontal flat plates in spaced parallel relation tothe plates l9, there being four of such holders, or two sets of two eachin spaced relation to the transverse center of the machine bed whichlatter isleft open as indicated at 38 to provide an area for heating aportion of the work piece or metal bar to be severed and formed withtapered, pointed or conical ends, as will be hereinafter more fully setforth. The toggle box holders or plates 31 are provided over the guiderails or tracks 2| with upwardly extending apertured lugs orbearings 39and the holders or plates M are provided with seats or grooves 46 whichin conjunction with the lugs or bearings 39 serve to retain toggle boxes4| on the holders 3'! in spaced relation but so as to move in and outwith the holders or plates 31 on the guide rails 3|. The lugs orbearings 39 receive and confine in the openings or-seats therein, theinner ends of guide rods 42 which'extend through stabilizing bearings 43mounted along the outer ends of the plates I9 or stabilizer bearingsupports formed there by and having their base portions 44 secured tosaid plates or supports l9 as by machine belts or the like'45. The capplates of the bearings 43 are removably-secured in position as by meansof machine screws 46 and the guide rods 42 bear resilient biasing meansor coil springs l between the bearings 43 and the lugs or bearings 39 ofthe holders or plates 31 tending to normally force thelatter and thetoggle boxes d! mounted thereon inwardly toward each other at therespective opposed pairs of such holders and boxes. The inner sides ofthe boxes 4| are provided with outwardly bevelled projections o'r bosses38 having horizontally elongated slots 49 therethrough and extendinginto the cavities or hollowed out portions 5|] of the boxes at the innersides of the latter. At their outer sides, the boxes are pro: vided withhorizontal counterbores 5| in alignment with the 'slots 49 with reducedouter bores 52 forming shoulders or seats at the outer ends of thecounterbores 5| through which compression bars 53 extend to move in andout but are normally held in by resilient biasing means or coil springs54 mounted on the bars 53 against stops formed by enlarged portions orheads 55 formed at the inner ends of the bars 53 within the cavities 5Band counterbores 5| through which the bars 53 extend with the springs 54confined between the shoulders at the outer ends of the counterbores 5|and the stops or heads 55 to normally force the bars inwardly. The powerfrom the eccentric wheels or discs 29 having the annular eccentricflanges 33 is delivered to a toggle mechanism for actuating the workpiece or metal bar grippers and holders to be later de-- scribed, andcomprising a tripper link 55 having a rounded inner end and extendingmovably through a slot 49 as seen more particularly in Figure 1 of thedrawings. A fixed link 5? is pivoted at its outer end on a threaded pin58 at the outer end of the cavity 5!) of each toggle box 4| and ispivotally connected by a freely movable pin 59 to the outer end of thetripper link 56 and the corresponding outer end of a sliding link 60within the inner angular portion or extension of the cavity 55 at whichpoint it is connected to or engaged by the compression bar 53 whichobviously may be pivoted or pivotally connected to the pin 59 or merelyabut the outer end of the tripper link 56. The inner end of the slidingand-pivoted link 60 is pivotally connectedas at 6| to each gripper jaw62 at the inner end of each toggle box 4|, said jaws being recessedcentrally of the length of their jaw engaging faces lengthwise thereofas indicated at 63 and vertically, to conform to the Work piece or bar Bto be pull pointed. The work piece or bar B is also designed to rest inV-shaped jaws or notches 64 of work piece guides 55 projecting up fromthe holders or plates 3! at each side thereof above the sides of themachine bed ll} aligned with the opening 33 and spaces between thegripper jaws 82 and between the sets of boxes 4| in position so that thegripper jaws 62 can properly grip or grasp the same. The connection ofthe sliding, movable or pivoted link 60 with each gripper jaw 62 iseffected through the medium of central outwardly projecting-shanks 6B ofthe gripper jaws 62 extending through slots or openings 61 at the innersides ofthe toggle boxes 4| and the outer sides of the-boxes Lil areprovided with bosses or lugs 68 if desired through which the bores 52extend, either one or two of the compression bars 53 being provided asdesired and located in line with the links 5501' 56 and 60, or above andbelow the same as desired. These lugs or bosses 68 are providedcentrally at the outer sides of the boxes as seen i Figure 2' of thedrawings and may constitute anchoring means for the boxes in abutmentwith the outer edges of the lugs or bearings 39 toguide the boxes intheir inward and outward movements and retain them against inwardmovement at right angles thereto toward the work piece or bar beingacted upon. Each box is provided with a cover 69 secured in position bymachine screws orl-bolts E0 to retain the toggle assembly in position.Primarily, the lugs or bearings 33 take the thrust of the springs 41 andthe guide rods 42 by reason of being formed integral with the holders orplates 37 and bearing against the outer sides of the toggle boxes 4|which move in and out with the holders 31. Of

course, the rods 42 are confined-or anchored in the bearings 39 and thesprings 41 are confined between the latter and the bearings 43 as notedon the rods 42, while the rods 42 move in and out in the bearings 43 asindicated in Figure 1 of the drawings. Thus, the toggle boxes move inand out in a horizontal plane in both the pull and return strokes on theguide rails 2 I and are norm 1. gripper jaws ged pairs upon oppositesides (if-the open 3i? and across the center -ei the latter petween' theperipheral edges of wheels 29 or flanges 32 thereof. Power-is"thenapplied-"to drivethe-shafts and eccentricwheels 29 in oppositedirections with the eccentric members or nangescs which are alike, incorresponding positions; as clearly shown in the drawings. As theeccentric wheels are driven,

their eccentric surfaces-credges are caused to pairs onsets-towardeach'other to grip the work piece or bar 3 upon opposite sides of thecentral portion at the opening 38, where the same is exposed to heatfrom a torch, gas flame or other suitable means for the purpose. In thisoperation, the links 51 and 60 are forced outwardly at their pivotedends at the pivots 59 against the action of the springs 54 whichnormally hold them inwardly to project the links 56 against theeccentrics, thus compressing the springs 54 and forcing the inner endsof the links 60 to slide inwardly in the cavity, thus projecting thegripper jaws 62 inwardly into gripping position to grasp the work pieceor bar B by reason of the pivots El moving inwardly toward each otherand transferring such movement to the gripper jaws 62 to hold the metalbar or Work piece during the pulling operation. As the eccentrics oreccentric wheels continue to rotate, the tripper links 56 are forcedinto the toggle boxes or slots of the bevelled bosses or inclinedprojections or camming surfaces 48 and the eccentric wheels engage thelatter to force the toggle boxes outwardly to separate the, same Whilesliding in a horizontal plane on the guide bars 2! and thus moving thegripper jaws 62 outwardly in opposite directions with respect to the twosets upon opposite sides of the point at which the portion of the workpiece or bar B is heated thus compressing the springs 47 and moving therods 42 outwardly through the bearings 43. As the toggle boxes and jawsare forced apart, pull thereby produced is exerted on the two portionsof the bar at opposite sides of the heated portion reduced to a meltedor soft condition which also may be produced electrically if desired. Asthis pull progresses, the drawn points are produced at the inner ends ofthe sections or portions of the rod or bar thus heated, the pulling,heating and resultant elongation continuing until the metal barseparates or bisects in such a manner as to leave points on thebisected, separated or severed ends of the bar drawn to a point, taperor cone as described. As the eccentric wheels continue to rotate, thesprings ii act to move the toggle boxes inwardly toward each other afterpassing the widest portions of the eccentrics or cams in oneoomplete'revolution until they pass the said widest portions 35 andapproach the sides of the flanges 32 at the abrupt curved portions 36 toreturn to their initial position. The

to point the inner ends thereof. By thismeans, tfi -aotioli easy foranothel' e 1e 35 at p w u: eat ether-fora insertion and e andmethe'SSJQSblltWaldIY l away fro"m'--a*hatd ear to" cause-the sameorator-compares other and eifi'cient'ma'n- I nerationsmay 'beveryeco-=nominallycarried on. mne macnmeis-very low and comparatively flat sothat it may be easily mounted upon a horizontal work surface, thusproducing a very stable and desirable machine and method for the purposeand where the operation and progress thereof may be easily observed. InView of the foregoing description taken in conjunction with theaccompanying drawings it is believed that a clear understanding of theconstruction, operation and advantages of the device will be quiteapparent to those skilled in this art. A more detailed description isaccordingly deemed unnecessary.

it is to be understood, however, that even though there is herein shownand described a preferred embodiment of the invention the same issusceptible to certain changes fully comprehended by the spirit of theinvention as herein described and the scope of the appended claims.

Having described the invention, what is claimed as new is:

l. A bar pull pointing machine comprising a bed, opposed eccentricwheels rotatably mounted in the bed, means for driving said wheels inopposite directions, means actuated by said eccenrice to grip the bar atpoints upon opposite sides of an area in the length of the bar heated toa soft condition to permit elongation and separation thereof, means toexert opposite pull upon said gripping means, means for releasing thepull bars and means for moving said pulling means and gripping meanstoward each other to their original positions. 7

2. A pull pointing machine for bars, comprising a bed, eccentric wheelsrotatably mounted in the bed and oppositely positioned to be driventoward each other in opposite directions, means for driving saideccentric wheels, a space between said wheels providing an area at whichthe bar is to be heated, means for supporting the bar over said spaceacross the bed, toggle means movable in opposite directions on the bedand actuated by said eccentric wheels, grippers actuated by said togglemeans to grip the bar upon opposite sides of the heated area andactuated by the eccentric wheels to cause opposite pull on the bar onopposite sides of the heated area to elongate and separate the bar andleave points on the separated ends, means to return said toggle means toits initialposition upon release thereof by the eccentric wheels incertain positions of the latter when the pull is released upon releaseof the grippers, and means for automatically causing the toggle meansand gripping means to move toward each other to initial gripping andpulling positions after the pull and grippers have been released.

3. A pull pointing machine including a base frame, grippers mounted onsaid frame in spaced relation and opposing each other in pairs to grip abar, means for supporting a bar across the frame in position to grip atspaced points upon opposite sides of an area in the length thereof, saidarea adapted to be heated to a soft condition such that opposite pullthereon on opposite sides of said area will cause resultant elongationof the bar and separation in such a manner as to leave points of taperedform at the separated ends, means for causing said grippers to grasp thebar and exert opposite pull thereon at such points and then to releasethe same upon the ends being separated, means for guiding said grippersin their movements upon the frame, spring means causing the release ofthe grippers when the ends have been separated, spring means on theframe to cause the grippers to be moved inwardly toward eachother uponrelease of the grippers and separation of said ends, said gripper movingand separating means including eccentric wheels having gradually taperedeccentric flanges upon opposite sides of the heated area and actingoutwardly in opposite directions to cause outward pull of the grippersin opposite directions and toggle mechanisms between the grippers andthe eccentric flanges to cause the gripping of the bar by said grippersand release thereof when the ends of the bars have been separated andpointed to move inwardly toward each other.

ERNEST WILLETT.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,051,949 Inscho 1 Aug. 25, 19362,136,538 Borwick NOV. 15, 1933 2,195,775 Gaspar Apr. 2, 1940

